Beryllium copper (BeCu), also known as Copper beryllium and Beryllium bronze, is a copper alloy with 0.5~3% beryllium and sometimes with other alloying elements. Beryllium copper combines high strength with non-magnetic and non-sparking qualities. It has many specialized applications in tools for hazardous environments, musical instruments, precision measurement devices, bullets, and aerospace.

Beryllium copper(BeCu) is a ductile, weldable, and machinable alloy. It can be heat-treated to improve its strength, durability, and electrical conductivity. Beryllium copper attains the highest strength (to 1,400 MPa) of any copper-based alloy. Due to its electrical conductivity, it is used in low-current contacts for batteries and electrical connectors.

Beryllium copper(BeCu) is used for measurement-while-drilling (MWD) tools in the directional drilling industry. A non-magnetic alloy is required, as magnetometers are used for field-strength data received from the tool.

Because Beryllium copper(BeCu) is non-sparking but physically tough and nonmagnetic, it is used to make tools that can safely be used in environments where there are explosive vapors and gases.